diff --git a/libguile/syscalls.h b/libguile/syscalls.h
index e10cc4870..3f2e69344 100644
--- a/libguile/syscalls.h
+++ b/libguile/syscalls.h
@@ -24,6 +24,8 @@
 
 /* ASYNC_TICK after finding EINTR in order to handle pending signals, if
    any. See comment in scm_syserror. */
+#include "async.h"
+
 #define SCM_SYSCALL(line)			\
   do						\
     {						\